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CostHelper > Home and Garden  > Driveways, Pools & Outdoor Living > Flagstone Patio

Flagstone Patio Cost


How Much Does a Flagstone Patio Cost?

 
low costDo-It-Yourself: $3-$5+ a Square Footaverage costInstalled: $7-$35+ a Square Foot
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Stone patios vary in style from cut rectangular smooth-edged pieces of stone to rough-edged stones laid out to fit together like a jigsaw puzzle. Flagstone is not a type of rock but rather a generic term for any large, flat, quarried pieces of natural stone used in outdoor landscaping or indoor flooring.

Typical costs:

  • Just the stone for a flagstone patio can cost $3-$5 a square foot or more, depending on location and the type and quality of stone, or about $600-$1,000 for an average patio up to 10'x20,' and $1,200-$2,000 for a larger 20'x20' area.
  • Professional installation of a flagstone patio can cost $7-$20 a square foot for dry-laid and $15-$35 or more a square foot for wet (mortared on reinforced concrete), depending on local rates and the complexity of the project, or about $700-$2,400 for a dry-laid patio up to 10'x20' and $1,500-$5,000 for a wet-set patio.
What should be included:
  • DIY Network provides how-to instructions[1] for a small dry-set flagstone patio, estimating this as an easy-to-moderate project, which takes one weekend and costs about $250-$500. Stone mason Mike Haduck provides a video demonstration[2] of installing a wet-set flagstone patio (mortared with Portland cement over a concrete base).
  • The thicker the flagstone, the more it will cost, and a wet installation costs more than dry. Typical widths are 1" minus, 1.5", 2", 2.5" and 3". Generally, 1" minus should only be installed with a concrete sub-base; and 2" to 3" widths are good for dry-laid stepping stones or a patio.
  • The three main steps for installing flagstone include preparing the area (digging and leveling); building the base (typically sand or gravel for dry-laid, and about a 4"-thick concrete slab for wet); and laying the stones (making them fit together like a jigsaw puzzle, cutting as needed and using mortar for a wet installation). Flagstones are typically large and heavy, so generally at least two people are needed to lay a flagstone patio.
  • Many types of stone can be called flagstone, including slate, sandstone, bluestone, fieldstone, limestone and more. LandscapingNetwork.com provides a comparison chart[3] for seven common kinds of stone that can be used as flagstones.
Additional costs:
  • Many contractors recommend sealing outdoor flagstone to preserve the stone and give it a more colorful "wet" look. Sealant averages $30 -$60 a quart, or $100 -$200 a gallon; stone cleaners run $10 -$40 a quart. Typically a patio should be cleaned and re-sealed every 18-36 months, depending on usage and exposure to the elements.
Shopping for a flagstone patio:
  • If possible, get several estimates. Be somewhat wary of a flat per-square-foot price quoted over the telephone; there are so many factors that can affect the cost, a contractor typically needs to see the site before giving a firm quote.
  • A flagstone patio can be installed by a handyman, landscaper or landscaper designer or contractor. For larger projects, search for members of the Association of Professional Landscape Designers[4] , Planet (Professional Landcare Network)[5] or the Marble Institute of America[6] (for natural stone distributors and suppliers).
  • Ask for a check references from satisfied customers; check that the company is properly insured and licensed; and look for any complaints filed with the Better Business Bureau[7] .
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External Resources:
  1.  www.diynetwork.com/how-to/how-to-install-a-flagstone-patio/index.html
  2.  www.youtube.com/watch?v=LiFazUnKwd4
  3.  www.landscapingnetwork.com/flagstone/compare.html
  4.  www.apld.com/
  5.  isgweb.landcarenetwork.org/directory/FindaContractor.aspx
  6.  www.marble-institute.com/directory/index.cfm
  7.  www.bbb.org/us/Find-Business-Reviews/
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